59 Statistics – 3
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| 1. ANOVA is appropriate in a study with a repeated measures design. |  |
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| 2. In a double-blind controlled study on the effect a new drug has on anxiety levels, patients are not told whether they are receiving drug or placebo. |  |
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| 3. The chi-squared test could be used in a study of comparison of pay vs. job satisfaction in two groups of workers, one male and the other female. |  |
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| 4. Chi-squared could be used to analyse the results of a questionnaire measuring level of anxiety in a random sample of the population. |  |
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| 5. The variation in a variable can be explained by the square of its correlation coefficient with another variable. |  |
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| 6. The closer the correlation coefficient ‘r’ is to zero, the fewer errors made in prediction. |  |
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| 7. In an IQ test showing normal distribution with a mean of 100 and a standard deviation of 15, approximately 15% of the population have an IQ less than 70. |  |
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| 8. The Fisher exact probability test should not be used for small numbers. |  |
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| 9. Incidence includes cases that are no longer current. |  |
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| 10. Non-parametric statistics can be measured by least squares. |  |
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| 11. The Mann–Whitney test could be used to analyse the results of a questionnaire measuring level of anxiety in a random sample of the population. |  |
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| 12. The mode is a measure of central tendency. |  |
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| 13. In an experiment to determine whether drug therapy or hypnosis is better in treatment to stop smoking, the results are measured by the number of cigarettes smoked after treatment. In this study the null hypothesis postulates there will be a significant difference between drug therapy and hypnosis in reduction of cigarette smoking. |  |
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| 14. A population pyramid can be used to describe the sex and age structure of a population. |  |
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| 15. The primacy effect includes deciding about a person by their physical appearance. |  |
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| 16. In categorical independent variables, regression is usually by the method of least squares. |  |
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| 17. Scores obtained on two successive administrations correlated 0.90 indicate reliability and not validity of a personality questionnaire. |  |
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| 18. A new ‘treatment’ is tried on gifted children, all of whom have an IQ greater than 140. If the mean IQ of the sample is 150, and if the treatment has no effect on IQ, the mean IQ that one would expect on re-testing 1 year later is slightly greater than 150. |  |
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| 19. The telephone directory can be used for random sampling. |  |
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| 20. Standard deviation is a measure of precision of an estimate. |  |
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| 21. A statement that an association between two variables is statistically significant means that, if the study is repeated, chances are that the significance of the association would be the same. |  |
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| 22. A result statistically significant at a level of 5% implies that there is a 5% chance that the results suggest a wrong conclusion. |  |
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| 23. Stratification increases the power of a study. |  |
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| 24. The T2 test is used for non-parametric variables. |  |
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| 25. In an experiment designed to investigate the effect of home background on intelligence, the family size is a dependent variable. |
